Brass Castle is an unincorporated community and census-designated place (CDP) located within Washington Township, in Warren County, in the U.S. state of New Jersey. As of the 2020 census, Brass Castle had a population of 1,536.
Brass Castle is named for Jacob Brass, an early settler of the area.
Geography
According to the United States Census Bureau, Brass Castle had a total area of , including of land and of water (0.54%).